On 8 May 2014 10:32, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
> +int kvm_cpu__get_endianness(struct kvm_cpu *vcpu)
> +{
> + struct kvm_one_reg reg;
> + u64 psr;
> + u64 sctlr;
> +
> + /*
> + * Quoting the definition given by Peter Maydell:
> + *
> + * "Endianness of the CPU which does the virtio reset at the
> + * point when it does that reset"
> + *
> + * We first check for an AArch32 guest: its endianness can
> + * change when using SETEND, which affects the CPSR.E bit.
> + *
> + * If we're AArch64, use SCTLR_EL1.E0E if access comes from
> + * EL0, and SCTLR_EL1.EE if access comes from EL1.
> + */
I note that the set of checks described here match the logic
of the ARM ARM BigEndian() pseudocode function, which is
a good sign.
thanks
-- PMM
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